MAX7000B データシートの表示（PDF） - Altera Corporation

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MAX7000B

Programmable Logic Device

Altera Corporation 

MAX 7000B Programmable Logic Device Data Sheet

Macrocells

The MAX 7000B macrocell can be individually configured for either

sequential or combinatorial logic operation. The macrocell consists of

three functional blocks: the logic array, the product-term select matrix,

and the programmable register. Figure 2 shows the MAX 7000B

macrocell.

Figure 2. MAX 7000B Macrocell

LAB Local Array

Parallel Logic

Expanders

(from other

macrocells)

Product-

Term

Select

Matrix

Global Global

Clear Clocks

2

From

I/O pin

Fast Input Programmable

Select

Register

Clock/

Enable

Select

Register

Bypass

PRN

D/T Q

ENA

CLRN

To I/O

Control

Block

VCC

Clear

Select

36 Signals

from PIA

16 Expander

Product Terms

Shared Logic

Expanders

To PIA

Combinatorial logic is implemented in the logic array, which provides

five product terms per macrocell. The product-term select matrix allocates

these product terms for use as either primary logic inputs (to the OR and

XOR gates) to implement combinatorial functions, or as secondary inputs

to the macrocell’s register preset, clock, and clock enable control

functions.

Two kinds of expander product terms (“expanders”) are available to

supplement macrocell logic resources:

■ Shareable expanders, which are inverted product terms that are fed

back into the logic array

■ Parallel expanders, which are product terms borrowed from adjacent

macrocells

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